Custom storage : autoload not triggered

version : grapes.min.js 0.15.10

Hi, I'm using a custom storage to load & store json data from/to a textarea. Using a custom storage seems to not support the autoload option. Instead, I have to manually trigger editor.load(), but it seems to update the editor so it messes with the noticeOnUnload option (which get triggered before any changes made by the user).

Here is the storageManager configuration :

storageManager

const editor = grapesjs.init({
...
storageManager: {
    type: 'customStorage',
    autosave: false,
    autoload: true
},
...
});

Here is the the custom storage :

custom storage

editor.StorageManager.add('customStorage', {
        load: function(keys, clb, clbErr) {

            var res = {}, data = storageEl.text(); // get textarea json content

           // custom logic
            if( "" !== data ) {
                try {

                    data = JSON.parse(data);
                    for (var i = 0; i < keys.length; i++) {
                        var v = data[keys[i]];
                        if(v) res[keys[i]] = v;
                    }

                } catch(e) { clbErr( "Error while parsing JSON : " + e.message ); }
            }

            clb( res );

        },
        store(data, clb) {
            var dataString = JSON.stringify( data );
            storageEl.text( dataString ); // updating textarea json content
            clb();
        }
    });

Is there any way to autoload a custom storage ? Thank you !